• In the “Object Definition and Containment” interface, create 2 objects "Boxes" and "Truck." Select the "display object value" box.
• Click on the Truck object and select object components.
• Add Boxes to the definition of the truck, define 6 boxes per truck. Do not check any other option in the component definition.
• Create a Start process that creates trucks. In the Object creation rules, check the “Stop after…” box, and define 2 in the number section. The start process will create only 2 trucks.
• Create a Start process that creates boxes.
• Create a generic process called Load truck, Open its buffers/capacity settings (Row 2) interface. Click on Define Q limits.
• Add Truck and Boxes to the Q Limits section, and then set the count of 2 for trucks, and 3 for boxes. That separates the queue into different capacity segments.
• In the advanced settings, open the Assembly/Disassembly interface. Click on "Enable object assembly" and select the "Assemble" column for truck to indicate that the truck will be assembled.
• Create a Generic process called Unload Truck and set its Assembly/Disassembly settings to split the grouped object, and split after processing. Do not delete the container as the truck will be reused for another load.
• Create an End process called End Boxes.
• Create the flow;
• Start (Trucks) to load truck
• Start (Boxes) to load truck
• Load truck to unload truck
• Unload truck to load truck
• Unload truck to end boxes
• Edit the properties of the Unload truck and select object routing from the process routing settings.
• Edit the routing, and set the object based routing option where;
• Boxes go to the End boxes process
• Truck go to the Load truck process
• Run the simulation, 2 trucks are loaded in the Load truck process, then unloaded in the unload truck before they cycle again to the loading area.

Link to Object Assembly and Disassembly (PDF)